These stark white cliffs were spat up by the sea and are slowly being retaken by it.

This giant geoglyph of mysterious origins is now the site of neo-pagan rituals.

This mysterious chalk figure of a horse has been recreated and restored for more than a century.

An 800-year-old island castle in Guernsey's main harbor.

An intricately decorated tiny place of worship.

Underground hospital complex constructed by slave laborers during the German occupation of the Channel Islands.

This lakeside bunker complex in Mamerki, Poland, housed the Supreme Military Command of Nazi Germany during World War II.

The first archaeological site discovered by aerial photography.

Once a safe haven for locals engaged in blood feuds, this 400-year-old fortified tower is now a museum showing what life was like for those lying in wait within its walls.

Beneath the southern end of the Golden Gate Bridge is the “Gibraltar of the West Coast,” a fort built to protect the San Francisco Bay from naval attack.

This mysterious tower is said to enshrine a dormant seven-headed serpent that once protected Vientiane from destruction.

Learn about the sweet, storied legacy of beekeeping in ancient Greece.

Swarms of dainty flying insects swarm into the Petaloudes Valley to get busy.

A dark, narrow tunnel that leads to a charming lake and waterfall.

This secret coastal village is studded with pastel-colored houses all piled on top of one another.

Scores of wax baby figurines add an unusual mood to this beautiful church on the Greek coast.

One of the best-preserved medieval streets in Europe.

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

This architecturally eclectic early-20th century mosque was built as a place of worship for the Islamic followers of a Jewish messiah.

An arts and culture melting pot inside an old roadside inn from the Ottoman era.

An abandoned Byzantine fortress and notorious prison.

A little-known park with unusual, half-ruined structures and a mystical energy.

One of the most photographed locations in the entire city.

Thousands of rusting train cars have been slowly falling apart on the edge of Greece's second largest city.